Impact of the physical processes in the modeling of HD49933

Details Impact of the physical processes in the modeling of HD49933 Impact of the physical processes in the modeling of HD49933

2009-07-24

arxiv.org/abs/0907.4336v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 3 figures, 7 tables

Scientific paper

Context : On its asteroseismic side, the initial run of CoRoT was partly devoted to the solar like star HD49933.The eigenmodes of this F dwarf have been observed with unprecedented accuracy. Aims : We investigate quantitatively the impact of changes in the modeling parameters like mass and composition. More importantly we investigate how a sophisticated physics affects the seismological picture of HD49933. We consider the effects of diffusion, rotation and the changes in convection efficiency. Methods : We use the CESAM stellar evolution code coupled to the ADIPLS adiabatic pulsation package to build secular models and their associated oscillation frequencies. We also exploited the hydrodynamical code STAGGER to perform surface convection calculations. The seismic variables used in this work are : the large frequency separation, the derivative of the surface phase shift,and the eigenfrequencies $\rm \nu_{\ell=0,n=14}$ and $\rm \nu_{\ell=0,n=27}$. Results : Mass and uncertainties on the composition have much larger impacts on the seismic variables we consider than the rotation. The derivative of the surface phase shift is a promising variable for the determination of the helium content. The seismological variables of HD49933 are sensitive to the assumed solar composition and also to the presence of diffusion in the models.

Affiliated with

Also associated with

No associations

Rating

Impact of the physical processes in the modeling of HD49933 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Impact of the physical processes in the modeling of HD49933, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact of the physical processes in the modeling of HD49933 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-310750